[tex]\Large \boldsymbol {} \rm Mn_2O_7 \\\\Mr(Mn_2O_7) = 2*Ar(Mn) + 7*Ar(O) = 2*55 + 7*16 = 222[/tex]
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[tex]\Large \boldsymbol {} \rm Mn_2O_7 \\\\Mr(Mn_2O_7) = 2*Ar(Mn) + 7*Ar(O) = 2*55 + 7*16 = 222[/tex]